We propose using punctured convolutional code for a Discrete Multitone (DMT
) Asymmetric Digital Subscriber Line (ADSL) system to improve the data rate
performance of ADSL. The theoretical performance of the systems with singl
e coding rate for all subchannels, and with adaptive coding rate for each s
ubchannel are presented respectively. It is found that the data rate perfor
mance of the proposed system is higher than the uncoded system.